I updated my S7 edge yesterday, and it changed my phone so badly that I hate it now. The new Icons are too small, and babyish, the notifications is so bad, the contacts and everything has been changed to the worst,.
I updated mine Monday night. Was seeing some weirdness yesterday with icons switching sizes randomly and lag, so I did the dreaded FDR. Set everything up again last night. Today, I've had a lot of, I guess you could say, unresponsiveness. I tried accessing an email and basically the phone was non responsive for about 20 minutes, until I was able to restart it. It's growing on me like any update. Over the next couple of days, it should settle down and if it remains responsive, I'll be fine with it.
I went from a Note 7 to S7 Edge on T-Mobile. I used the transfer features to get my setup from the N7 onto the S7 and at that point (pre-Nougat), everything looked just like my Note 7, just without the cool stylus related tools.
Fast forward to installing Nougat recently and... no perceptible changes. My icons stayed where they were, didn't change sizes. Everything on the screens was similar. A couple of the apps have different UI's, like the phone dialer, but that's not a big deal.
My brain is trying to remind me that I had to turn icon frames off again. That's the only change I recall post-install to make it look and work like it did pre-install.